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To answer e) calculate the volume of THIS cone when h = 2 meters then divide the answer by 0.2 m^^3/minute to get the answer in minutes.

To answer f), you have to know at what rate the liquid drains from the inverted come (i.e. as soon as the tank is empty, the tap turns itself off..., but this information cannot be found on the question you gave us!

But it is the same deal: calculate the volume of THIS cone when h = 2 meters then divide the answer by volume of draining/minute to get the answer in minutes.

Add the 2 answers e) + f) together to find out what the total time is!

We can only assume that 4b), 4c), or 4d) provided some information that gives, or allows for the computation of, the outflow rate for 4f) and really can't help any further for that question without it. Do you still need additional information for 4e)? Is this an assignment or test you need to complete or are you just looking for the justification for those given answers?